Is Endometrial cancer hereditary?

Most cases of endometrial cancer are sporadic, meaning they occur by chance rather than through inherited gene mutations; however, approximately 5% to 10% of cases are hereditary. If a family history of endometrial cancer exists, it may be linked to specific genetic syndromes, most notably Lynch syndrome, which follows an autosomal dominant inheritance pattern.

Is endometrial cancer considered hereditary?

While the majority of endometrial cancer diagnoses are not hereditary, a small subset of patients carries an inherited predisposition. When endometrial cancer is hereditary, it is usually due to a germline mutation in DNA mismatch repair (MMR) genes. These mutations significantly increase the lifetime risk for not only endometrial cancer but also colorectal and ovarian cancers.

How does genetics influence the risk of endometrial cancer?

Hereditary forms of endometrial cancer, such as those associated with Lynch syndrome, typically follow an autosomal dominant inheritance pattern. This means an affected parent has a 50% chance of passing the genetic mutation to each child. Unlike some conditions, de novo or spontaneous mutations that lead to these specific hereditary syndromes are less common than inherited mutations passed down through generations.

When should genetic testing be considered?

Genetic testing is recommended based on clinical criteria rather than being universal for all patients. You should discuss genetic counseling and testing with your physician if you meet any of the following criteria:

• Personal history of endometrial cancer diagnosed before age 50.


• A family history involving multiple relatives with Lynch syndrome-associated cancers (colorectal, endometrial, ovarian, gastric).


• Tumor testing (such as immunohistochemistry or MSI testing) that suggests a defect in mismatch repair proteins.


• A known family mutation in genes like MLH1, MSH2, MSH6, PMS2, or EPCAM.

What is the role of genetic counseling for families?

Genetic counseling is vital for families affected by hereditary endometrial cancer. A counselor can help interpret test results, calculate personal risk percentages, and discuss reproductive options. For those planning pregnancies, options like Preimplantation Genetic Testing (PGT) may be available to identify embryos carrying the familial mutation, helping to prevent the inheritance of the predisposition to endometrial cancer.

Next steps

• Consult with a board-certified genetic counselor to discuss your family history.


• Review your pathology reports with an oncologist to see if your tumor was screened for MSI (Microsatellite Instability).


• Connect with the 31 members at DiseaseMaps.org who have shared their experiences with this condition.


• Speak with a gynecologic oncologist about personalized cancer screening schedules if you are confirmed to carry a high-risk mutation.

Medical disclaimer: This information is for educational purposes only and does not replace professional medical advice, diagnosis, or treatment.

References

• National Cancer Institute (NCI): Genetics of Endometrial Cancer


• NIH Genetic and Rare Diseases Information Center (GARD): Lynch Syndrome


• Orphanet: Lynch Syndrome


• Society of Gynecologic Oncology (SGO): Hereditary Cancer Risk Assessment